CN105422935A - Low-oil-pressure relief valve and pressure relief method thereof - Google Patents
Low-oil-pressure relief valve and pressure relief method thereof Download PDFInfo
- Publication number
- CN105422935A CN105422935A CN201510913494.7A CN201510913494A CN105422935A CN 105422935 A CN105422935 A CN 105422935A CN 201510913494 A CN201510913494 A CN 201510913494A CN 105422935 A CN105422935 A CN 105422935A
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- China
- Prior art keywords
- oil
- pressure
- spring
- sleeve
- spring seat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 230000008676 import Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 5
- 238000011065 in-situ storage Methods 0.000 abstract description 7
- 238000007689 inspection Methods 0.000 abstract description 2
- 238000013024 troubleshooting Methods 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/04—Construction of housing; Use of materials therefor of sliding valves
- F16K27/041—Construction of housing; Use of materials therefor of sliding valves cylindrical slide valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a low-oil-pressure relief valve and a pressure relief method thereof. The low-oil-pressure relief valve comprises a base, a sleeve and a slide valve; the base and the sleeve are mutually matched, and the slide valve is arranged in the sleeve; a spring is arranged between the slide valve and the sleeve; one end of the spring is connected to one end of the sleeve through a first spring seat, and the other end of the spring is connected to one end of the slide valve through a second spring seat; a pressure oil inlet is formed in one end of the sleeve, and a quick-closing oil inlet and a quick-closing oil outlet are formed in the other end of the sleeve; the quick-closing oil inlet, the quick-closing oil outlet and the second spring seat are located on the same side; a return oil outlet is formed in the base; a proximity switch is arranged at the end, connected to the spring, of the slide valve; a pressure gage and a pressure transmitter are disposed at the pressure oil end of the sleeve; the outer diameter of the slide valve is larger than the inner diameter of the base. According to the low-oil-pressure relief valve and the pressure relief method thereof, the structure is simple; operation is stable and reliable; the relief valve is used by cooperating with the proximity switch, the pressure gage and the pressure transmitter so as to observe the working state remotely and in situ, and troubleshooting, maintaining and routine safety inspection are facilitated; therefore, time and labor are saved, and safe and smooth operation of a whole machine is guaranteed.
Description
Technical field
The present invention relates to a kind of hydrovalve, particularly relate to a kind of low oil pressure safety valve and pressure releasing method thereof.
Background technique
The low oil pressure safety valve that steam turbine uses, moves to make guiding valve and can be as accurate as position, needs often to observe guiding valve and other inner members and overhaul.And existing low oil pressure safety valve is owing to being arranged on steam turbine inside, be difficult to the loss directly observing spool position or spring shape and miscellaneous part, therefore inspection and maintenance and routine safety patrol and examine comparatively difficulty, compare and take time and effort, and the serious complete machine that also can affect runs.
Summary of the invention
The present invention is in order to solve the defect and deficiency that exist in above-mentioned prior art, providing one can long-range and in situ observation working state, easy access, maintenance and routine safety are patrolled and examined, thus time saving and energy saving, ensure complete machine security of operation low oil pressure safety valve and pressure releasing method thereof smoothly.
Technological scheme of the present invention: a kind of low oil pressure safety valve, comprise the base and sleeve that cooperatively interact and the guiding valve be arranged in sleeve, spring is provided with between described guiding valve and sleeve, described spring one end is connected to sleeve one end by the first spring seat, the spring the other end is connected to guiding valve one end by the second spring seat, described sleeve one end is provided with pressure oil import, the sleeve the other end is provided with speed and closes oil inlet and speed pass oil export, the position of described pressure oil import is corresponding with the position of the first spring seat, described speed closes oil inlet and speed closes oil export and the second spring seat is positioned at the same side, described base is provided with oil return outlet, described guiding valve and spring connecting end are provided with proximity switch, the pressure oil end of described sleeve is provided with pressure gauge and pressure transmitter, the external diameter of described guiding valve is greater than the internal diameter of base.
The present invention due to hydraulic fluid pressure not high, the reposition force of spring is adopted to carry out guiding valve adjustment, thus make its structure simple, stable and reliable operation, coordinates proximity switch, pressure gauge, pressure transmitter uses together can long-range and in situ observation working state, easy access, maintenance and routine safety are patrolled and examined, thus time saving and energy saving, ensure that complete machine security of operation is smooth and easy.
Preferably, described sleeve and spring connecting end are closed, the other end opening, described first spring seat is connected with sleeve closes end by the first adjusting bolt, described first adjusting bolt is through sleeve closes end and the first spring seat, tighten with the hexagon nut with flange of a M10 outside sleeve closes end, tighten with the 1 type hexagon nut of a M5 inside the first spring seat.
This kind of structure makes the relative position of regulating sleeve that it can be suitable and spring seat, can the degree of tightness of suitable Regulation spring, thus spring is better worked.
Preferably, described guiding valve and spring connecting end are closed, the other end opening, described second spring seat is connected with guiding valve closed end by the second adjusting bolt, described second adjusting bolt is through guiding valve closed end and the second spring seat, tighten with the hexagon nut with flange of the 2nd M10 outside guiding valve closed end, tighten with the 1 type hexagon nut of the 2nd M5 inside the second spring seat.
This kind of structure makes the relative position of regulating slide valve that it can be suitable and spring seat, makes spool position accurate, can be good at base seal or open.
Preferably, be provided with the first ball in described first spring seat, described first adjusting bolt, through the first ball, is provided with the second ball in described second spring seat, and described second adjusting bolt is through the second ball.
This kind of structure is more reliably smooth and easy time the first adjusting bolt and the second adjusting bolt are regulated.
Preferably, described proximity switch is connected to the second adjusting bolt end, is provided with the chamfering that two coordinate base outside described guiding valve closed end.
This kind of structure makes operator observe position and the sealing Chengdu precision cuts more of guiding valve by proximity switch; Make guiding valve more closely reliable with coordinating of base simultaneously.
Pressure transmitter can be contained in the import of whole low oil pressure safety valve by the present invention, is contained in bottom guiding valve by proximity switch.
This kind of structure can pass through proximity switch, and signal feed back, to middle control, will be shown on the middle control computer page by DCS, and if there is problem, unit operation personnel and operator, can find the problem very soon according to these data.
This kind of structure can be transported to middle control by pressure transmitter the oil pressure value of reality simultaneously, can monitor the oil pressure value of whole system, simultaneously also can set certain force value, whole system lower than setup pressure value, compressor emergency shutdown or warning.
A pressure releasing method for low oil pressure safety valve, comprises the steps:
1) during start, pressure oil P enters on the right side of spring, the displacement thus produce a pulling force to spring to the left of driving member guiding valve;
2) be pushed into and base contacts by guiding valve, base has contacted a sealing surface and has ensured that speed is closed oil and can not be connected with oil return T with guiding valve;
3) when pressure oil oil pressure be reduced to be less than or equal to 0.24MPa time, the elastic force of oil pressure ratio spring is little, and guiding valve will displacement to the right thus cause speed to close oil connecting with oil return under the pulling force of spring, and system middling speed closes oil pressure can reduce to 0MPa rapidly.
Preferably, the normal operating pressure of this safety valve is 0.24 ~ 0.8MPa.
The present invention due to hydraulic fluid pressure not high, the reposition force of spring is adopted to carry out guiding valve adjustment, thus make its structure simple, stable and reliable operation, coordinates proximity switch, pressure gauge, pressure transmitter uses together can long-range and in situ observation working state, easy access, maintenance and routine safety are patrolled and examined, thus time saving and energy saving, ensure that complete machine security of operation is smooth and easy.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is oil circuit schematic diagram of the present invention;
The hexagon nut with flange of 1. the one M10 in figure, 2. the first adjusting bolt, 3. sleeve, 4. the first ball, 5. the first spring seat, 6. spring, 7. guiding valve, 8. the second adjusting bolt, 9. base, 10. the 1 type hexagon nut of a M5 is tightened, the hexagon nut with flange of 11. the 2nd M10,12. proximity switches, 13. pressure gauges, 14. second balls, 15. second spring seats, the 1 type hexagon nut of 16. the 2nd M5,17. pressure transmitters, 18. seal ring mounting grooves, 19. pressure oil imports, 20. oil return outlets, 21. speed close oil inlet, and 22. speed close oil export.
Embodiment
Below in conjunction with accompanying drawing and working principle, the present invention is further detailed explanation, but be not limiting the scope of the invention.
As illustrated in fig. 1 and 2, a kind of low oil pressure safety valve, comprise the base 9 and sleeve 3 that cooperatively interact and the guiding valve 7 be arranged in sleeve 3, spring 6 is provided with between guiding valve 7 and sleeve 3, spring 6 one end is connected to sleeve 3 one end by the first spring seat 5, spring 6 the other end is connected to guiding valve 7 one end by the second spring seat 15, sleeve 3 one end is provided with pressure oil import 1, sleeve 3 the other end is provided with speed and closes oil inlet 21 and speed pass oil export 22, the position of pressure oil import 19 is corresponding with the position of the first spring seat 5, speed closes oil inlet 21 and speed closes oil export 22 and the second spring seat 15 is positioned at the same side, base 9 is provided with oil return outlet 20, guiding valve 7 and spring 6 connecting end are provided with proximity switch 12, the pressure oil end of sleeve 3 is provided with pressure gauge 13 and pressure transmitter 17, the external diameter of guiding valve 7 is greater than the internal diameter of base 9.Sleeve 3 is closed with spring 6 connecting end, the other end opening, first spring seat 5 is connected with sleeve 3 closed end by the first adjusting bolt 2, first adjusting bolt 2 is through sleeve 3 closed end and the first spring seat 5, tighten with the hexagon nut with flange 1 of a M10 outside sleeve 3 closed end, tighten with the 1 type hexagon nut 10 of a M5 inside the first spring seat 5.Guiding valve 3 is closed with spring 6 connecting end, the other end opening, second spring seat 15 is connected with guiding valve 7 closed end by the second adjusting bolt 8, second adjusting bolt 8 is through guiding valve 7 closed end and the second spring seat 15, tighten with the hexagon nut with flange 11 of the 2nd M10 outside guiding valve 7 closed end, tighten with the 1 type hexagon nut 16 of the 2nd M5 inside the second spring seat 15.The first ball 4, first adjusting bolt 2 is provided with through being provided with the second ball 14, second adjusting bolt 8 in the first ball 4, second spring seat 15 through the second ball 14 in first spring seat 5.Proximity switch 12 is connected to the second adjusting bolt 8 end, is provided with the chamfering that two coordinate base 9 outside guiding valve 7 closed end.Sleeve 3 is also provided with some seal ring mounting grooves 18, seal ring mounting groove 18 is arranged on the first spring seat 15 end.
A pressure releasing method for low oil pressure safety valve, comprises the steps:
4) during start, pressure oil P enters on the right side of spring, the displacement thus produce a pulling force to spring to the left of driving member guiding valve;
5) be pushed into and base contacts by guiding valve, base has contacted a sealing surface and has ensured that speed is closed oil and can not be connected with oil return T with guiding valve;
6) when pressure oil oil pressure be reduced to be less than or equal to 0.24MPa time, the elastic force of oil pressure ratio spring is little, and guiding valve will displacement to the right thus cause speed to close oil connecting with oil return under the pulling force of spring, and system middling speed closes oil pressure can reduce to 0MPa rapidly.
The normal operating pressure of this safety valve is 0.24 ~ 0.8MPa.
Working principle of the present invention:
During start, pressure oil P enters on the right side of spring, a displacement thus pulling force is produced to spring to the left of driving member guiding valve, guiding valve is pushed into and touches jail with base, base and guiding valve touch jail has a sealing surface guarantee speed pass oil can not link up with oil return T, when pressure oil oil pressure be reduced to be less than or equal to 0.24MPa time, the elastic force of oil pressure ratio spring is little, and guiding valve will displacement to the right thus cause speed to close oil connecting with oil return under the pulling force of spring, and system middling speed closes oil pressure can reduce to 0MPa rapidly.
Note: the normal operating pressure of this safety valve is 0.24 ~ 0.8MPa.
The present invention coordinates proximity switch, pressure gauge, and pressure transmitter uses together can the working state of long-range and this valve of in situ observation, is convenient to patrol and examine in maintenance and routine safety.
The signal fed back by proximity switch can judge what state this valve is in, can in situ observation pressure oil pressure by pressure gauge, easy access and checking meter, pressure oil signal is passed to backstage DCS with the pattern of analog amount by pressure transmitter, is convenient to the oil pressure situation that operator on duty observes pressure oil.
Sleeve diameter of the present invention is 34f6/H7, and the maximum outside diameter of sleeve is 48k6/H7.
The present invention due to hydraulic fluid pressure not high, the reposition force of spring is adopted to carry out guiding valve adjustment, thus make its structure simple, stable and reliable operation, coordinates proximity switch, pressure gauge, pressure transmitter uses together can long-range and in situ observation working state, easy access, maintenance and routine safety are patrolled and examined, thus time saving and energy saving, ensure that complete machine security of operation is smooth and easy.
Claims (8)
1. a low oil pressure safety valve, it is characterized in that: it comprises the base and sleeve that cooperatively interact and the guiding valve be arranged in sleeve, spring is provided with between described guiding valve and sleeve, described spring one end is connected to sleeve one end by the first spring seat, the spring the other end is connected to guiding valve one end by the second spring seat, described sleeve one end is provided with pressure oil import, the sleeve the other end is provided with speed and closes oil inlet and speed pass oil export, the position of described pressure oil import is corresponding with the position of the first spring seat, described speed closes oil inlet and speed closes oil export and the second spring seat is positioned at the same side, described base is provided with oil return outlet, described guiding valve and spring connecting end are provided with proximity switch, the pressure oil end of described sleeve is provided with pressure gauge and pressure transmitter, the external diameter of described guiding valve is greater than the internal diameter of base.
2. a kind of low oil pressure safety valve according to claim 1, it is characterized in that: described sleeve and spring connecting end are closed, the other end opening, described first spring seat is connected with sleeve closes end by the first adjusting bolt, described first adjusting bolt is through sleeve closes end and the first spring seat, tighten with the hexagon nut with flange of a M10 outside sleeve closes end, tighten with the 1 type hexagon nut of a M5 inside the first spring seat.
3. a kind of low oil pressure safety valve according to claim 2, it is characterized in that: described guiding valve and spring connecting end are closed, the other end opening, described second spring seat is connected with guiding valve closed end by the second adjusting bolt, described second adjusting bolt is through guiding valve closed end and the second spring seat, tighten with the hexagon nut with flange of the 2nd M10 outside guiding valve closed end, tighten with the 1 type hexagon nut of the 2nd M5 inside the second spring seat.
4. a kind of low oil pressure safety valve according to claim 2, it is characterized in that: in described first spring seat, be provided with the first ball, described first adjusting bolt, through the first ball, is provided with the second ball in described second spring seat, and described second adjusting bolt is through the second ball.
5. a kind of low oil pressure safety valve according to claim 3, is characterized in that: described proximity switch is connected to the second adjusting bolt end, is provided with the chamfering that two coordinate base outside described guiding valve closed end.
6. a kind of low oil pressure safety valve according to claim 1, it is characterized in that: described sleeve is also provided with some seal ring mounting grooves, described seal ring mounting groove is arranged on the first spring seat end.
7. the pressure releasing method of a kind of low oil pressure safety valve according to claim 1, is characterized in that: it comprises the steps:
1) during start, pressure oil P enters on the right side of spring, the displacement thus produce a pulling force to spring to the left of driving member guiding valve;
2) be pushed into and base contacts by guiding valve, base has contacted a sealing surface and has ensured that speed is closed oil and can not be connected with oil return T with guiding valve;
3) when pressure oil oil pressure be reduced to be less than or equal to 0.24MPa time, the elastic force of oil pressure ratio spring is little, and guiding valve will displacement to the right thus cause speed to close oil connecting with oil return under the pulling force of spring, and system middling speed closes oil pressure can reduce to 0MPa rapidly.
8. the pressure releasing method of a kind of low oil pressure safety valve according to claim 7, is characterized in that: the normal operating pressure of this safety valve is 0.24 ~ 0.8MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510913494.7A CN105422935B (en) | 2015-12-12 | 2015-12-12 | A kind of low oil pressure safety valve and its pressure releasing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510913494.7A CN105422935B (en) | 2015-12-12 | 2015-12-12 | A kind of low oil pressure safety valve and its pressure releasing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105422935A true CN105422935A (en) | 2016-03-23 |
| CN105422935B CN105422935B (en) | 2017-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510913494.7A Active CN105422935B (en) | 2015-12-12 | 2015-12-12 | A kind of low oil pressure safety valve and its pressure releasing method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5928023A (en) * | 1982-08-09 | 1984-02-14 | Toshiba Corp | Residual liquid fuel purifying method of gas turbine and device thereof |
| CN1133624A (en) * | 1993-10-29 | 1996-10-16 | 西门子公司 | Controlling motor, in particlular for quick-action stop valves |
| CN201671666U (en) * | 2010-03-26 | 2010-12-15 | 西安陕鼓汽轮机有限公司 | Main throttle valve of steam turbine |
| EP2392781A1 (en) * | 2010-06-02 | 2011-12-07 | Siemens Aktiengesellschaft | Compact control-stop-valve for a steam turbine |
| CN203515688U (en) * | 2013-09-26 | 2014-04-02 | 浙江华元汽轮机械有限公司 | Emergency governor pilot valve |
-
2015
- 2015-12-12 CN CN201510913494.7A patent/CN105422935B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5928023A (en) * | 1982-08-09 | 1984-02-14 | Toshiba Corp | Residual liquid fuel purifying method of gas turbine and device thereof |
| CN1133624A (en) * | 1993-10-29 | 1996-10-16 | 西门子公司 | Controlling motor, in particlular for quick-action stop valves |
| CN201671666U (en) * | 2010-03-26 | 2010-12-15 | 西安陕鼓汽轮机有限公司 | Main throttle valve of steam turbine |
| EP2392781A1 (en) * | 2010-06-02 | 2011-12-07 | Siemens Aktiengesellschaft | Compact control-stop-valve for a steam turbine |
| CN203515688U (en) * | 2013-09-26 | 2014-04-02 | 浙江华元汽轮机械有限公司 | Emergency governor pilot valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105422935B (en) | 2017-11-03 |
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Address after: Jiaxing City, Zhejiang province 310000 Chongfu town Tongxiang city Hangzhou Road No. 308 Patentee after: Zhejiang jieteyou Power Machinery Co.,Ltd. Address before: Jiaxing City, Zhejiang province 310000 Chongfu town Tongxiang city Hangzhou Road No. 308 Patentee before: ZHEJIANG JIETEYOU POWER MACHINERY Co.,Ltd. |
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Denomination of invention: A low oil pressure safety valve and its pressure relief method Effective date of registration: 20210303 Granted publication date: 20171103 Pledgee: Bank of Hangzhou Limited by Share Ltd. Tongxiang branch Pledgor: Zhejiang jieteyou Power Machinery Co.,Ltd. Registration number: Y2021330000167 |
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Date of cancellation: 20220402 Granted publication date: 20171103 Pledgee: Bank of Hangzhou Limited by Share Ltd. Tongxiang branch Pledgor: Zhejiang jieteyou Power Machinery Co.,Ltd. Registration number: Y2021330000167 |
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Denomination of invention: A kind of low oil pressure safety valve and pressure relief method thereof Effective date of registration: 20220904 Granted publication date: 20171103 Pledgee: Zhejiang Tongxiang rural commercial bank Limited by Share Ltd. Chong Fu Branch Pledgor: Zhejiang jieteyou Power Machinery Co.,Ltd. Registration number: Y2022330002047 |
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Granted publication date: 20171103 Pledgee: Zhejiang Tongxiang rural commercial bank Limited by Share Ltd. Chong Fu Branch Pledgor: Zhejiang jieteyou Power Machinery Co.,Ltd. Registration number: Y2022330002047 |